<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>React State</title>
    <script src="https://cdn.bootcss.com/react/16.4.0/umd/react.development.js"></script>
    <script src="https://cdn.bootcss.com/react-dom/16.4.0/umd/react-dom.development.js"></script>
    <script src="https://cdn.bootcss.com/babel-standalone/6.26.0/babel.min.js"></script>
</head>
<body>
<div id="example"></div>
<script type="text/babel">
    //Add the class
    class Clock extends React.Component {
        //Add a class constructor to initialize the state
        constructor(props) {
            super(props);
            this.state = {date: new Date()};
        }
        //Use This.state in the render () method to modify the current time
        render() {
            return (
                <div>
                    <h1>
                        Hello,World!
                    </h1>
                    <h2>
                        New Is {this.state.date.toLocaleTimeString()}.
                    </h2>
                </div>
            );
        }
    }
    ReactDOM.render(
        <Clock/>,
        document.getElementById('example')
    );
</script>
</body>
</html>